fix(image-info): Correct image reference (#155)

We need to include `ostree-image-signed` here

Author: EyeCantCU

image-info.sh

@@ -3,7 +3,7 @@
 set -oue pipefail
 
 IMAGE_INFO="/usr/share/ublue-os/image-info.json"
-IMAGE_REF="docker://ghcr.io/$IMAGE_VENDOR/$IMAGE_NAME"
+IMAGE_REF="ostree-image-signed:docker://ghcr.io/$IMAGE_VENDOR/$IMAGE_NAME"
 
 case $FEDORA_MAJOR_VERSION in
   38)